The correct statement(s) regarding defects in solids is (are)

The compound(s) that exhibit(s) geometrical isomerism is(are)

The correct statement(s) about the compound $$\mathrm{H_3C(HO)HC-CH=CH-CH(OH)CH_3~~(X)}$$ is (are)

p-Amino-N, N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue. Treatment of the aqueous solution of Y with the reagent potassium hexacyanoferrate(II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of Y with the solution of potassium hexacyanoferrate(III) leads to a brown coloration due to the formation of Z.

The compound X is